Nut-lock.



.ioHN EnwAnn Hear/IAN, or CiNGINNA'rI, onto.

imm-Loox. Y'

,d p Appli-Carignan@ March 7,1917. seria11va15aoe4.

To all whom t may concern:

. Be it knownjthatLJoHN EDWARD `Hnn MAN,a citizen of lthe United States, resid- Y ing inthe city of Cincinnati, in the vcounty of Hamilton and State of Ohio,'have inthe following is a specification.

This invention relates to improvements 1n vented anew and useful Nut-Lock, of which devices for locking nuts, more especially' those upon the axles of automobiles, wagons, and other vehicles, but is also applicable'to the ordinary bolt, and it consists of the novel construction, arrangement and combination of parts hereinafter described and claimed.

The objects of the invention are: First, to provide. a neat, simple, inexpensive and practical device, which will securely lock a nut against outward rotation upon an axle or bolt and which, when desired, will enable the nut to be removed readily; second, which shall be completely housed within the nut against rain or other foreign substances; third, in which none of its parts can be accidentally displaced, and fourth, which will leave the nut flush on yall sides.

The above objects are accomplished by the construction illustrated in the accompanying drawing, in which-1 Figure I is a sectional transverse view of the nut on an axle, showing the locking pawl, hereinafter described, in engagement with a notch in the axle; the interior reduced end of the unlocking bolt,hereinafter described, and, in perspective, the notches in the axle, and the body of the unlocking bolt; Fig. II is a transverse view ofthe nut and axle, showing'the lockingconstruction when the nut is locked; Fig. III is a similar view, but showing theconstruction when the nut is unlocked. and Fig. IV is an enlarged view of the unlocking bolt, showing the reduced sides of its interior end.

Silnilar numerals refer to similar parts throughoutthe several views.

Referring .to the accompanying drawing by numerals, it will be seen that my invention comprises a threaded axle or bolt 1. provided with notches 2, so constructed and arranged, as shown in the drawing, that when the nut is being turned on, the pawl,

hereinafterv described, will pass successively into and out of them, but whenever the nut is turned in the opposite direction, said pawl impingesaganst the abrupt edge of .Specification of Letters Patent.

increasing Jrhe security of the lock.

Patented Feb. 5, 1918.

thenotch into Vwhich it first falls, locking the nut.4 Said notches are made quite deep, for reasons hereinafter mentioned. Into the side of the nut 3,'and at right 'angles to said axle there is drilled a recess 4, which has its exterior portion 5 threaded for the reception ofa plug 6, adapted thereto. Into said recess a pawl 7 is positioned, secured to said plug by being wedged into slot 8. The point of said pawl is positioned beneath the longitudinal center of said recess,

whereby a more positive, deeper and, consequently, a securerimpingement thereof with said notches is afforded, -and thereby obviating the liability of accidental displacement of said pawl and the unlocking of the nut through the wearing away of the upper abrupt edges of said notches over which said pawl depressingly slides, when the nut is turned'on. Into the face of the nut and at right angles to said recess an aperture 9 is drilled, threaded to receive bolt 10, adapted thereto. Said aperture extends to said recess. Said bolt l0 has at its interior end amajor-reduced side l1, constructed and adapted to rest beneath said pawl at its longitudinal center and adjacent thereto when the nut is locked. and a minor-reduced side 12, which, when brought beneath said pawl byturning the bolt 10 suiiiciently, raises said pawl out of impingement with said notches, unlocking the nut. Said reduced sides are adapted to admit of deep impingement of said pawl with said .notfhea i x ald pawl is made preferably of spring steel.

It will be observed by the drawing that in either the locked or unlocked position of the device, the pawl and unlocking bolt are so constructed and arranged that each automatically locks the other against loosening or displacement.

The notches used have this advantage over grooves extending. the length of the threaded portion, vof an axleV or bolt; the former are completely housed in by the nut,

excluding all foreignsubstances from enter- Y ing the mechanism ofthe lock and interfering therewith. which is not the case with grooves extending beyond the nut, whilel for locking purpose the notches are equally effective, and can be made more readily. Y

Both the pawl plug and the unlocking bolt are turned in place by an ordinary screwdriver, when positioned, leave a c Hushksuffrage, l 'as :win beV elo-sera@ Vey the drawing, obviating': accidental `external interference With theY locking mechanisni What I" claim:

nl. The combination ofra recess,

positioned Within V'saidV recess; 4athreaded j aperture enteringsaid recess at'ri'ght an- 'c .glee` thereto, and a bolt adapted thereto, said Y Vbolt'Qliavii'ig redneed ,sides VVat its r`end,fbot11,7

saidipawlandsaidbolt b'eingiso constructed,.- l arranged' and disposed' asjtotloel-:eaeh: the. i5-

' secured therein; 4a threadedzaperture Yenterc ing said recess-atv rightrangles. thereto,;and i other, against"displacement. Y L

aV Vthreaded unlockingi'boltl adapted thereto, said bolt having reduced sides at its interior end, disposed to rest beneath said pawl,

whereby saidibolt'is'loeked against displaceinent. u

The combination of a threaded axle or bolt; provided Withnotches or grooves; a

nut provided with an exteriorly-entering' threaded recess; apawl secured to a threaded plug; a threaded aperture entering at right angles to said pawl, and a .threadmlv bolt,g provided with freducedsidesat its interiorportion-bothsaidfpawl and said bolt being constructed, arranged and disposed, each toA lock the other against displacement, and whereby said-nut is locked and .11n-

locked.

JOHN EDARD HERMAN. 

